1-(cyanophenoxy)-2-hydroxy-3-tert.-butylamine propanes



United States Patent Ofice 3,541,130 Patented Nov. 17, 1970 3,541,130 l-(CYANOPHENOXY)-2-HYDROXY-3-TERT.-

BUTYLAMINE PROPANES Herbert Koppe, Ingelheim (Rhine), Albrecht Engelhardt,

Mainz (Rhine), and Karl Zeile, Ingelheim (Rhine), Ger.

many, assignors to Boehringer Ingelheim G.m.b.H., 111-" US. Cl. 260465 9 Claims ABSTRACT OF THE DISCLOSURE A compound selected from the group consisting of racemates of 1-phenoXy-2-hydroxy-3-tert.-butylamino propanes of the formula wherein R is selected from the group consisting of alkynyloxy of 2 to 4 carbon atoms, -(CH OH, (CH ),,CN and (CH -NH where x is an integer from to 3, COOH and COOR where R is alkyl of 1 to 4 carbon atoms; R is selected from the group consisting of hydrogen, alkoxy and alkylthio of 1 to 4 carbon atoms, --CN and alkenyl and alkynyl of 2 to 4 carbon atoms and R is selected from the group consisting of hydrogen, halogen and alkyl and alkoxy of 1 to 4 carbon atoms, their optically active isomers and their non-toxic, pharmaceutically acceptable acid addition salts of said racemates and said optically active isomers which compounds possess bradycardia activity and isoproterenol-antagonistic activity.

OBJECTS OF THE INVENTION It is an object of the invention to provide novel 1- phenoxy-Z-hydroxy-3-tert.-butylamino propanes of Formula I and their acid addition salts.

It is another object of the invention to provide novel therapeutic compositions having bradycardia and isoproterenol-antagonistic activities.

These and other objects and advantages of the invention will become obvious from the following detailed description.

THE INVENTION The novel compounds of the invention are compounds selected from the group consisting of racemates of lphenoxy-2-hydroxy-3-tert.-butylamino propanes of the formula wherein R is selected from the group consisting of alkynyloxy of 2 to 4 carbon atoms, (CH OH, -(CH ),,CM and (CH NH where x is an integer from 0 to 3, COOH and COOR where R is alkyl of 1 to 4 carbon atoms; R is selected from the group consisting of hydrogen, alkoxy and alkylthio of 1 to 4 carbon atoms, -CN and alkenyl and alkynyl of 2 to 4 carbon atoms and R is selected from the group consisting of hydrogen, halogen and alkyl and alkoxy of 1 to 4 carbon atoms, their optically active isomers and their non-toxic, pharmaceutically acceptable acid addition salts of said racemates and said optically active isomers.

Examples of non-toxic, pharmacologically acceptable acids suitable for addition salts are inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid and organic acids such as methane sulfonic acid, acetic acid, lactic acid, tartaric acid, ascorbic acid, S-chlorotheophylline and the like.

The compounds according to the present invention may be prepared by a number of different methods involving known chemical reaction principles; however, among these, the following methods have been found to be most convenient and eflicient:

Method A.By reacting an epoxide of the formula where the Rs have the same meanings as in Formula I, with tert.-butylamine in the presence of an inert organic solvent, such as ethanol.

Method B.-By reacting a l-substituted phenoxy-Z- hydroxy-3-halo propane of the formula @w-om-en-omam R1 OH wherein the Rs have the same meanings as in Formula I, with a tert.-butyl halide.

Method D.--By hydrolizing an oxazolidinone of the formula wherein the Rs have the same meanings as in Formula I. Method E.-By reacting a substituted phenolate of the formula wherein the Rs have the same meanings as in Formula I and M is a monovalent cation, preferably an alkali metal,

with a 1-halo-2-hydroxy-3-tert.-butylamino-propane.

Method F.By hydrogenating a l-substituted phenoxy- Z-hydroxy 3 benzyl tert. butylamino propane of the R2 (VII) 3 wherein the Rs have the same meanings as in Formula I.

Method G.By reducing a ketone of the formula wherein the Rs have the same meanings as in Formula I, with catalytically activated hydrogen or a boranate, such as aluminum boranate.

The starting compounds of the Formulas II to VIII for the above methods are known compounds or may readily be prepared by known methods. For example, the substituted 1-phenoxy-2,3-epoxy propanes of Formula II may be prepared by reacting a corresponding substituted phenolate of Formula VI under alkaline conditions with a 1 halo 2,3 epoxy-propane such as epichlorohydrin. Most of the corresponding phenols are known in the prior art and they are easily obtainable by conventional methods. Cyanophenols, particularly those with alkyl and/or alkoxy groups, may be prepared by splitting off water from the correspondingly substituted phenolic benzaldoximes which are prepared from known phenolic benzaldehydes. Cyanophenols with an ally] substituent are obtained by reacting the cyanophenol with allyl bromide with rearrangement of the intermediate allyl ether into the final product. Halocyanophenols are obtained by reacting the cyanophenol with a hydrogen halide in the presence of H Cyanomethylphenols can be made by introducing a nitro group into a benzylnitrile and converting it into a phenol group by reducing, diazotizing and boiling down. The aminomethylphenols are prepared by reduction of the corresponding cyanomethylphenol. Other processes are described in Belgian Pat. No. 641,133, British Pat. No. 894,198 and in the literature.

The free bases of Formula I obtained by any of the above methods, A through G, may subsequently be transformed into non-toxic, pharmacologically acceptable acid addition salts by conventional methods, that is, by acidifying a solution of the free base with the desired acid and recovering the acid addition salt by evaporation of the solvent or by precipitation, for instance.

The compounds of the general Formula I possess on the CHOH grouping an asymmetric C-atom and, consequently, occur in the form of racemates as well as in the form of optically active antipodes. The optically active compounds can be obtained in that one proceeds either from optically active starting compounds or that the racemates obtained are split into their optical antipodes in the usual manner, for example, by means of dibenzoyl D tartaric acid or D-3-bromocamphor-8-sulfonic acid.

The compounds according to the present invention, that is those embraced by Formula I, and their non-toxic, pharmacologically acceptable acid addition salts, have useful pharmacodynamic properties. More particularly, they produce bradycardia and at the same time act as N-isopropyl-noradrenaline (Isoproterenol) antagonists as shown in dogs and guinea pigs. Thus, the tachycardiac effects caused by the administration of N-isopropyl-noradrenaline are suppressed or eliminated by prior administration of one of the compounds of the present invention, and cardiac arrhythmia are equalized by them. In other words, the compounds according to the present invention block the sympathetic nervous system of the heart. Consequently, the areas of indication for the compounds of the present invention are hypertension, angina pectoris, cardiac arrhythmia, digitalis intoxication and pheochromocytoma disorders. They may also be used in conjunction with coronary dilator or sympathicomimetic agents.

The compositions of the invention having bradycardia (VIII) 4 and isoproterenol antagonistic activity are comprised of a small but effective amount of at least one compound selected from the group consisting of racemates of l-phenoxy-2-hydroxy-3-tert.-butylamino propanes of the formula wherein R is selected from the group consisting of alkynyloxy of 2 to 4 carbon atoms, (CH OH, (CH CN and (CH NH where x is an integer from 0 to 3, COOH and COOR' where R is alkyl of 1 to 4 carbon atoms; R is selected from the group consisting of hydrogen, alkoxy and alkylthio of 1 to 4 carbon atoms, CN and alkenyl and alkynyl of 2 to 4 carbon atoms and R is selected from the group consisting of hydrogen, halogen and alkyl and alkoxy of 1 to 4 carbon atoms, their optically active isomers and their non-toxic, pharmaceutically acceptable acid addition salts of said racemates and said optically active isomers and a major amount of a pharmaceutical carrier. The compositions may be in the form of injectable solutions or suspensions, tablets, dragees, sustained release tablets, etc. The usual useful dose is 1 to 300 mg., preferably 1 to 150 mg., for oral administration and 1 to 20 mg. for parenteral administration.

The novel method of the invention of inducing bradycardia and of suppressing tachycardiac effects of N-isopropyl-noradrenaline in warm-blooded animals comprises administering to warm-blooded animals a safe and effective amount of at least one of the novel compounds of the invention. The said compounds may be administered orally, parenterally or rectally. The usual dosage is 0.002 to 5 mg./k-g., depending upon the method of administration.

In the following examples there are described several preferred embodiments to illustrate the invention. However, it should be understood that the invention is not intended to be limited to the specific embodiments.

EXAMPLE I Preparation of l-(2-cyano-3-methyl-phenoxy)2- hydroxy-3-tert.-butylamino propane.HCl

1-(2-cyano-3-methylphenoxy)-2,3-epoxy propane, prepared from 17 gm. (0.128 mol) of 2-cyano-3-n1ethylphenol and 12.2 gm. (0.132 mol) of epichlorohydrin in ml. of l N NaOH, was dissolved as a dark, impure viscous oil in 200 ml. of methanol, and 29 ml. of tert.- butylamine were added thereto. After refluxing the mixture for 2 hours, the solvent was distilled off under vacuum, and the brown residue was extracted with dilute HCl. The clear solution was filtered over charcoal and was made alkaline with NaOH. The precipitating base was taken up in ether and the organic phase was separated and was washed repeatedly with water and dried over MgSO After concentration up to weight constancy, 4.5 gm. of a base remained and this was dissolved in a small amount of ethanol. The hydrochloride salt was precipitated by an addition of ethereal HCl and was isolated as a solid product. It was recrystallized from acetonitrile with an addition of ether followed by a second recrystallization from ethanol with an addition of ether to obtain 1-(2-cyano-3methylphenoxy)-2-hydroxy-3-tert.- butylamino propane hydrochloride having a melting point of 178-180 C.

EXAMPLE II Preparation of 1-(2-cyano-4-chlorophenoxy) -2-hydroxy- 3-tert.-butylamino propane.HCl

5.7 gm. (0.02 mol) of 1-(2-cyanophenoxy)-2-hydroxy- 3-tert.-butylamino propane (prepared analogous to Example I) were dissolved in 32 ml. of concentrated HCl and while stirring at 45 C., 2.27 gm. of 35% hydrogen peroxide were added dropwise'so that the temperature did not exceed 65 C. Thereafter, the temperature was maintained at 60 C. for 30 minutes and the mixture was concentrated in vacuo at the end of which a solid residue remained. The raw hydrochloride was recrystallized from ethanol under an addition of ether to obtain 3 gm. of 1 (2 cyano-4-chlorophenoxy)-2-hydroxy-3-tert.-buty1- amino propane hydrochloride having a melting point of ISO-182 C.

EXAMPLE III Preparation of 1-(2-methyl-4-cyanophenoxy)-2-hydroxy- 3-tert.-butylamino propane.HCl

24 gm. of 1-(2-methyl-4-cyanophenoxy)-2,3-epoxypropane in 150 ml. of ethanol were reacted with 25 ml. of tert.-butylamine. After refluxing the reaction mixture for 2 hours, the solvent was distilled off in vacuo, and the residue was dissolved in dilute HCl. After extraction with ether, the aqueaus phase was made alkaline with NaOH and the precipitated base was taken up in ether. The ether solution was washed with H O, dried over MgSO and finally the ether was distilled 01f. The residue was dissolved in 100 ml. of ethanol and ethereal HCl was added thereto. The precipitating crystalline hydrochloride was isolated and recrystallized from methanol with an addition of ether to obtain 17 gm. of pure 1-(2-methyl-4- cyanophenoxy)-2-hydroxy-3-tert.-butylamino propane hydrochloride having a melting point of 230-231 C.

EXAMPLE IV Preparation of 1-(2-methoxy-4-cyanophenoxy)-2-hydroxy-3-tert.-butylamino propane.HCl

9.9 gm. (0.048 mol) of 1-(2-methoxy-4-cyanophenoxy)-2,3-epoxy propane in 100 ml. of ethanol were heated with 14.6 gm. (0.02 mol; 21 ml.) of tert.-butylamine for 3 hours over a water bath. After distillation of the solution in vacuo, the residue was digested with dilute HCl and the solution was separated from the insoluble matter. The aqueous phase was made alkaline with NaOH and the precipitated base was extracted with ether, washed with water, and the organic phase was dried over 'MgSO After distilling off the ether, the oily residue was dissolved in ethanol, admixed with ethereal HCl, and the precipitating crystals of 1-(2-methoxy-4-cyanophenoxy)- Z-hydroxy-3-tert.-butylamino propane hydrochloride were vacuum filtered and recrystallized from ethanol with an addition of ether to obtain 7.1 gm. of the product having a melting point of 210-213 C.

EXAMPLE V Preparation of 1-(2-aminomethyl-4-chlorophenoxy)-2- hydroxy-3-tert.-butylamino propane.2HC1

6.3 gm. (0.02 mol) of 1-(2-cyano-4-chlorophenoxy)-2- hydroxy-3-tert.-butylamino propane hydrochloride were dissolved in 100 ml. of methanol containing ml. of NH and the mixture was hydrogenated under normal pressure at 20 C. over Raney-Nickel. After separation of the catalyst the solvent was distilled ofl? in vacuo, and the residue was admixed with ether and water. After an addition of a small amount of NaOH, the aqueous phase was separated and the organic phase was washed with water and dried over MgSO After distilling oh? the ether, a solid residue remained which was recrystallized from ethyl acetate with an addition of petroleum ether to obtain 1 (2-aminomethyl-4-chlorophenoxy)-2-hydroxy-3- tert.-butylamino propane. The base was dissolved in eth- 6 anol and ethereal HCl was added thereto. The precipitated crystals of the hydrochloride of the base were isolated to obtain 3.1 gm. of the hydrochloride having a melting point of 118-120 C.

EXAMPLE VI Using the procedure of Example V, 1-(2-cyanophenoxy-2-hydroxy-3-tert.-buty1amino propane hydrochloride was hydrogenated to obtain I-(Z-aminomethylphenoxy-)-2-hydroxy-3-tert.-butylamino propane dihydrochloride having a melting point of 220-222 C.

EXAMPLE VIII Using the procedure of Example IV, 1-(2-methoxycarbonylphenoxy)-2,3-epoxy-propane was reacted with tert.- butylamine to form l-(2-methoxycarbonylphenoxy)-2-hydroxy-3-tert.-butylamino propane hydrochloride having a melting point of 144-146 C.

EXAMPLE IX By saponification of 1-(2-methoxycarbonylphenoxy)-2- hydroxy-3-tert.-butylamino propane with sodium hydroxide, there was obtained 1-(2-hydroxycarbonylphenoxy)-2- hydroxy-3-tert.-buty1amino propane hydrochloride having a melting point of 138-140 C.

EXAMPLE X Using the procedure of Example IV, tert.-butylamine and 1 (2-methoxy-5-cyanophenoxy)-2,3-epoxy propane were reacted to obtain l-(2-methoxy-5-cyanophenoxy)-2- hydroxy-3-tert.-butylamino propane hydrochloride having a melting point of 149152 C.

EXAMPLE XI Using the procedure of Example IV, tert.-butylamine and 1-(4-methoxycarbonylphenoxy)-2,3-epoxy propane were reacted to form 1-(4-methoxycarbonylphenoxy)-2- hydroxy-3-tert.-butylamino propane hydrochloride having a melting point of 205207 C.

EXAMPLE XH Using the procedure of Example IV, tert.-butylamine and 1-(2-hydroxymethylphenoxy)-2,3-epoxy propane were reacted to form 1-(Z-hydroxymethylphenoxy)-2-hydroxy- 3-tert.-butylamino propane oxalate having a melting point of 180783 C.

EXAMPLE XIII 1 (4 methoxycarbonylphenoxy)-2-hydroxy-3-tert.- butylamino propane was chlorinated analogous to Example II to obtain 1-(2-chloro-4-methoxycarbonylphenoxy)- 2-hydroxy-3-tert.-butylamino propane hydrochloride having a melting point of 208-210" C.

EXAMPLE XIV Using the procedure of Example IV, 20 gm. of 1-(3- hydroxymethylphenoxy)-2,3-epoxy propane and 18.5 gm. of tert.-butylamine were reacted to obtain 1-(3-hydroxymethylphenoxy) 2-hydroxy-3-tert.-butylamino propane having a melting point of 8284 C.

EXAMPLE XV Preparation of l-(2-cyanophenoxy)-2-hydroxy-3-tert.- butylamino propane-HCI 15 gm. (0.085 mol) of 1-(2-cyanophenoxy)-2,3-epoxy propane were dissolved in ml. of ethanol and 18.6 gm. (0.255 mol) of tert.-butylamine were added thereto. After standing for 1 hour at room temperature, the solution was heated at 6070 C. for 2 hours after which the volatile constituents were distilled off in vacuo. The residue was digested with dilute HCl, and the insoluble constituents were vacuum filtered off. Then the filtrate was made alkaline with NaOH and the precipitating base was taken up in ether. After the ether solution had been dried over MgSO the ether was distilled off and the residue was dissolved in ethanol and by addition of ethereal HCl, the hydrochloride was precipitated therefrom in crystalline form which after recrystallization from ethanol with an addition of ether gave 9.8 gm. of 1-(2- cyanophenoxy) 2 hydroxy-3-tert.-butylamino propane hydrochloride having a melting point of l63-165 C.

EXAMPLE XVI Preparation of 1-(4-cyanophenoxy)-2-hydroxy-3-tert.- butylamino-propane-HCI 5.7 gm. (0.02 mol) of 3-tert.-butyl-5-(4-cyanophenoxymethyl)-oxazolidinone-(2) were dissolved in 50 ml. of ethanol. After addition of a solution of gm. of potassium hydroxide in ml. of water, the solution was refluxed for 2 hours and then the ethanol was distilled off in vacuo, and the residue was extracted with ether. The ethereal phase was separated, dried over MgSO and the MgSO was filtered off. After concentration of the ether solution, the solid raw base was recrystallized from ethyl acetate to obtain a product having a melting point of 100-105 C. After dissolving the crystalline base in ethanol, ethereal hydrochloric acid was added and the solid was isolated and again recrystallized from ethanol/ ether to obtain 1.9 gm. of 1-(4-cyanophen0xy)-2- hydroxy-3-tert.-butylamino propane hydrochloride having a melting point of 187189 C.

EXAMPLE XVII Preparation of l-(3-cyanophenoxy)-2-hydroxy-3-tert.- butylamino-propane oxalate 9.6 gm. (0.05 mol) of 1-(3-cyanophenoxy)-2-hydr0xy- 3-amino propane were dissolved in 40 ml. of dimethylformamide and 100 ml. of tetra'hydrofuran and 4.2 gm. (0.05 mol) of pulverized sodium bicarbonate were added thereto. Then, 6.9 gm. (0.05 mol) of tert.-butylbromide were added and the mixture was refluxed for 24 hours. After the mixture had been cooled, the inorganic solid was filtered oh and the solvent mixture was distilled off in vacuo. The residue was dissolved by heating in ethyl acetate and the insoluble inorganic portions were vacuum filtered oil? and the filtrate was admixed with petroleum ether. The base precipitated in solid form and was isolated and recrystallized from ethyl acetate with an addition of petroleum ether to obtain 1-(3-cyanophenoxy) 2-hydroxy-3-tert.-butylamino propane having a melting point of 108110 C.

After having been dissolved in ether, the said product was admixed with an ethereal oxalic acid solution whereby the oxalate precipitated in amorphous form. It was isolated, dissolved in a small amount of ethanol and slowly ether was added thereto. 2.7 gm. of the oxalate salt occurred in colorless crystalline form and after being vacuum filtered and dried, melted at 154-157 C. under decomposition.

EXAMPLE XVIII Preparation of 1-(Z-propargyloxyphenoxy)-2-hydroxy- 3-tert.-butylamino-propane oxalate 7.15 gm. (0.035 mol) of l-(2-propargyloxyphenoxy)- 2,3-epoxy propane were dissolved in 70 ml. of ethanol and after 11 gm. (0.15 mol) of tert.-butylamine were added thereto, the mixture was refluxed for 2 hours. After the mixture was cooled, the solvent was distilled oif in vacuo and the oily residue was digested with dilute HCl. The aqueous phase was extracted with ether and the acid, aqueous solution was then made alkaline with NaOH. The base precipitating in oily form was taken up in ether and the organic phase was washed with water and dried over MgSO After the ether had been distilled otf, the residue was dissolved in absolute ether, and a solution of 2 gm. of oxalic acid in 10 ml. of acetone was added. The precipitating oxalate was recrystallized from ethanol with an addition of ether to obtain 4.6 gm. of 1-(2-propargyloxyphenoxy) 2 hydroxy 3-tert.-butylamino propane oxalate having a melting point of 132l34 C.

EXAMPLE XIX 1 (2 nitro-4-chlorophenoxy)-2-hydroxy-3-tert.-butylamino propane was hydrogenated in the presence of Raney-nickel in methanol to obtain l-(2-amino-4-chlorophenoxy)-2-hydroxy-3-tert.-butylamino propane dlhydrochloride having a melting point of 260-262 C.

PHARMACEUTICAL EXAMPLES Example A--Tablets Parts 1 (2 hydroxymethylphenoxy)-2-hydroxy-3-tert.

butylamino propane.HCl 35.0 2,6-bis (diethylamino)-4,8-dipiperidino-pyrimidopyrimidine 75.0 Lactose 164.0 Corn starch 194.0 Colloidal silicic acid 14.0 Polyvinylpyrrolidone 6.0 Magnesium stearate 2.0 Soluble starch 10.0

Gm. 1 (2-cyano-3-methyl-phenoxy)-2-hydroxy-3-tert.-

butylamino propane hydrochloride 40.0 Corn starch 164.0 Potassium phosphate 240.0 Magnesium stearate 1.0

Gm. 1 (2-cyano3-methylphenoxy)-2-hydroxy-3-tert.-

butylamino propane hydrochloride 50.0 2.6 bis-(diethylamino)-4,8-dipiperidino-pyrimido- [5,4-d]-pyrimidine 75.0 Lactose 164.0 Corn starch 194.0 Colloidal silicic acid 14.0 Polyvinylpyrrolidone 6.0 Magnesium stearate 2.0 Soluble starch 10.0

The individual components are intensively admixed and the mixture is granulated in the usual manner. The granulate is compressed into 1000 tablets of 500 mg., 445 mg. or 515 mg.

Example B-Gelatin capsules The content of the capsules is composed as follows:

1 (3-hydroxymethylphenoxy)-2-hydroxy-3-tert.-

butylamino propane.HCl 25.0 Corn starch 175.0

1 (2-cyano-4-chlorophenoxy)-2-hydroxy-3-tert.-

butylamino propane maleinate 25.0 Corn starch 175.0

The ingredients are intensively admixed and 200 mg. portions of the mixtures are filled into gelatin capsules of suitable size. Each capsule contains 25 mg. of the optically active substance.

Preparation-The active substance and the EDTA-salt were dissolved in suflicient water and distilled water to mg./kg. for each compound) to 4 animals per compound and ascertaining the decrease of the basic frequency of the heart beat by means of an electrical recorder.

After each determination of the decrease of the basic frequency, l'y/kg. of isoproterenol [=a(isopropylaminomethyl) protocatechuyl alcohol] was administered to the same animal intravenous injection, and the maximum frequency change was determined.

The results of both determinations (bradycardia activity and isoproterenol antagonistic activity) were plotted as a doseactivity curve, and the curve for each compound was compared with a corresponding curve for the standard control compound dichloroisoproterenol (DCI), a known effective B-adrenergic blocking agent. The followthe desired volume was added. The solution was filtered ing results were obtained.

TABLE I Isoproterenol- Bradyeardia antagonistic Compound activity activity 1-(Q-hydroxymethylphenoxy)-2-hydroxy-3-tert.-butylamino propane.HOl 8X DCI 24X DCI 1-(3-hydroxymethylphenoxy)-2-hydroxy-3-tert.-butylarmno propane.HCl 8X DCI X DCI 1-(2-methoxy-S-cyanophenoxy)-2-hydroxy-3-tert.-butylarn1no propane.HOl 6.5x DCI 10.9X DCI 1-(Z-cyano-3-methylphenoxy)-2-hydroxy-3-tert. butylammo propaneHCl 10X DCI 60X DCI 1-(2-methyl-4-cyanophenoxy) 2-hydroxy3-tert-butylam1no pr0pane.HCl 43X DCI 33X DCI free of suspended particles and filled into 1 cm.-arnpules under aseptic conditions. Then, the ampules were sterilized and sealed so that each of these ampules contained mg. of active substance.

Example D-Sustained release tablets- 1 Racemic 1-(Z-hydroxymethylphenoxy)-2-hydroxy- 3-tert.-butylamino propane oxalate Carboxymethylcellulose (CMC) 295.0 Stearic acid 20.0 Cellulose acetate phthalate (CAP) 40.0

1 (2-cyano-3-methylphenoxy)-2-hydroxy-3-tert.-

butylamino-propane hydrochloride 25.0

Carboxymethylcellulose (CMC) 295.0

The active substance, the Carboxymethylcellulose and the stearic acid are intensively admixed and the mixture is granulated in the usual manner, a solution of the cellulose acetate phthalate in 200 ml. of a mixture of ethanol and ethylacetate is used for this purpose. The granulate is then compressed into 380 mg. kernels, which are in the usual manner coated .with a sugar containing 5% solution of polyvinylpyrrolidone in water. Each tablet contains 25 mg. of active ingredients.

PHARMACOLOGICAL DATA The compounds of the invention were tested for fi-adrenergic blocking activity in adult laboratory guinea pigs under urethane anaesthesia.

The bradycardia activity of the compounds was determined by administering the test compounds by intravenous injection at 5 progressively increasing dosages (0.1 mg./kg., 0.3 mg./kg., 1 mg./kg., 3 mg./kg. and 10 Various modifications of the compositions and method of the invention may be made without departing from the spirit or scope thereof.

We claim:

1. A compound selected from the group consisting of racemates of l-phenoxy-Z-hydroxy 3 tert. butylaminopropanes of the formula R3 011 Ha wherein R is --CN, R is hydrogen and R is selected from the group consisting of hydrogen, chlorine and alkyl and alkoxy of 1 to 4 carbon atoms, their optically active isomers and the non-toxic, pharmaceutically acceptable acid addition salts of said racemates and said optically active isomers.

2. A compound of claim 1 which is 1-(2-cyano-3- methylphenoxy)-2-hydroXy-3 tert. butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

3. A compound of claim 1 which is 1-(2-cyano-4- chlorophenoxy) 2 hydroxy-3-tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

4. A compound of claim 1 which is l-(2-rnethyl-4- cyanophenoxy) 2 hydroxy 3-tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

5. A compound of claim 1 which is l-(2-methoxy-4- cyanophenoxy) 2 hydroxy 3-tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

6. A compound of claim 1 which is 1-(2-methoxy-5- cyanophenoxy) 2-hydroxy-3-tert.-butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

7. A compound of claim 1 which is 1-'(2-cyanophenoxy) 2 hydroxy 3 tert. butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

8. A compound of claim 1 which is 1- (4-cyanophenoxy) 2 hydroxy 3 tert. butylamino propane and its non-toxic, pharmaceutically acceptable acid addition salts.

3,541,130 11 12 9. A compound of claim 1 which is 1- (3 -cyan0- CHARLES B. PARKER, Primary Examiner phenoxy) 2 hydroxy 3 I butyla'mino P D H. TORRENCE Assistant Examiner and its non-toxic, pharmaceutlcally acceptable acid add1- tion salts. us 1 X R,

References Cited 5 260-253 307 348 470 471 473 50117 50119 519 FOREIGN PATENTS 521, 570.7, 570.8, 570.9 575 613; 424 32)4, 3 09, 317: 1,126,165 7/1956 France. 330

6,409,883 3/1965 Netherlands. 

